• Terrain


    Shoes best for road, track and light gravel. See the best road shoes.


    Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

    Good to know

    As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

  • Arch support
    Arch support

    Neutral / cushion / high arch

    Shoes for runners who do not need any additional arch support (Around 50% of runners). Best for people with normal, high or medium high arches. See the best neutral shoes.

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / flat feet

    Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

    Good to know

    - Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
    - More about arch support in this video.
    - Find your arch type by following steps from this video.

  • Use

    Daily running

    Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


    Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

    Good to know

    If you want just one pair of shoes, buy a shoe for daily running.

  • Price
  • Weight
    Men: 8.5oz
    Women: 7.3oz
  • Heel to toe drop
    Heel to toe drop
    Men: 4mm
    Women: 4mm

    The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

    There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.

  • Heel height
    Heel height
    Men: 26mm
    Women: 26mm
  • Forefoot height
    Forefoot height
    Men: 22mm
    Women: 22mm
  • Width
    Men: normal
    Women: normal
  • Release date
    Release date
    Jul 2017
Show more facts


We spent 7 hours reading reviews from experts and users. In summary, this is what runners think:

8 reasons to buy

  • Most users observed that the Saucony Zealot ISO 3 was able to offer great cushioning.
  • One tester narrated that the shoe felt great all throughout his walk and run.
  • Several runners observed that the bounce of the midsole has been retained.
  • Another runner expressed that it’s well-balanced in its construction.
  • A few testers said that the shoe performed well on both road and trail.
  • Some runners said that the toe box had an agreeable space for toe-splay.
  • A user felt that this iteration offered a more relaxed upper compared to the uppers of the previous versions.
  • One runner expressed that this was one of the shoes that delivered a well-cushioned experience.

7 reasons not to buy

  • Some of the testers felt that this shoe ran small.
  • One user narrated that the cushioning under the ball of her foot was not enough.
  • A few runners said that the arches felt loose.
  • One tester commented on the white midsole not matching the dark upper.
  • A small group of users was not satisfied with the number of color options the shoe came in.
  • One user mentioned that he was stuck in between sizes which left him at an inconvenience. Going up a size, he felt that this shoe was a tad bigger. Choosing a size down, he expressed that the shoe was a bit tight.
  • One runner felt pain on the ball of his foot every time he ran with the shoe.

Bottom line

The Saucony Zealot ISO 3 is a neutral, road running shoe that’s in the higher price range. This newest edition in the Zealot series possesses the fan favorite features that were present from the previous iterations. On top of that, components were tweaked to enhance the shoe’s cushioning, ride and responsiveness. This makes the shoe well-balanced and lightweight, ready to take on any activity or running session.


Expert Reviews

Experts are runners, who post reviews at youtube, directly at RunRepeat or at their own websites. Each expert is categorized from level 1 to level 5 based on expertise. See stats on expert reviews and how we calculate scores here.

Are you an expert? Apply to contribute here.

91 / 100 based on 8 expert reviews

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Updates to Saucony Zealot ISO 3

  • To fulfill Saucony’s promise to deliver a lightweight running shoe, the newer version of the Zealot ISO was designed to be lighter than its predecessor. Formerly, the men’s variant was approximately 9.5 ounces or 269 grams. The weight of this current version was further reduced to 8.5 ounces or 241 grams, making it lighter and nimbler.
  • The upper was updated with a covering of engineered mesh. This new material is tougher than the one featured in the previous version, but still possesses elastic characteristics to make the top part of the shoe breathable and stretchy.
  • The overlays were lessened, making the upper look sleek and minimal. Previously, there was an external cage that acted as the shoe’s saddle, keeping the midfoot in place. This structure has been removed. To keep the midfoot in place and lightly retain the shape of the shoe, FlexFilm overlays were placed on key areas of the upper.
  • The proprietary PWRGRID+ on the previous iteration has been removed. The cushioning of the shoe is still plush, but it’s not as plush as the Zealot ISO 2. This redesign, however, has slightly improved the support and responsiveness of this neutral runner.
  • On the upper part of the shoe, a molded heel collar was added to help lock the heel down, preventing it from moving while the runner is in motion.

Saucony Zealot ISO 3 size and fit

The Saucony Zealot ISO 3 comes in standard running shoe measurements. Runners can purchase a pair using their usual shoe size preferences. It comes in the standard width measurements of B – Medium for females and D – Medium for males.

The shoe is equipped with the ISOFit system. This design innovation allows the runners a custom and secure fit with a bootie upper construction that’s combined with shoelaces that are looped through synthetic straps.


The outsole of the Saucony Zealot ISO 3 is made up of two types of rubber – the XT-900 and IBR+. These rubbers are appropriately marked upon closer inspection of the bottom of the shoe. The combination of both materials enhances flexibility and durability.

To be more specific, the XT-900 is the tougher rubber of the two. It is located on the tip of the forefoot and the curve of the heel. These areas are more vulnerable to wear and tear, thus this premium carbon rubber with exceptional traction and durability was added.

The IBR+, on the other hand, has more to do with flexibility. It is approximately 33% lighter and more cushioned compared to the standard blown rubber. This material is placed on the majority of the forefoot, mostly under the medial plantar area of the sole.

Lastly, the outsole was designed with the Tri-Flex tread. The forefoot, mostly, bears a chevron pattern, with indentions through each arrow and between each line. The rest of the tread, especially under the heel area, has trapezoid-like sections with similar indentations.

The entire Tri-Flex tread works with the EverRun Topsole for better dispersion of force upon impact. It also allows the shoe to move together with the runner with lesser resistance while also providing the necessary traction on common surfaces.


The main technology found in the midsole area of the shoe is called Everun. This is mainly responsible for the shoe’s responsiveness. Everun is an extra layer placed nearer to the foot, providing a livelier run while dispersing the impact upon landing. Saucony describes this rubber compound as a mechanism for continuous cushioning. It works by ensuring smoother heel landings and reduced pressure on the forefoot when gearing up for the toe-off.

Saucony saw fit to add a highly elastic sock liner to line the footbed. This affords more cushioning underfoot, accompanying the underfoot comfort the midsole foam already delivers. Runners also have the option to remove this insole to replace it with Ortholites or other custom inserts.


The upper sports different shoe features that permit a custom fit. Starting with the Isofit, this system is composed of two key properties of the shoe – the sock-like construction combined with the unique lacing system.

The sock-like construction made of stretchable mesh that hugs the foot in all the right places. Because it has elastic characteristics, it molds to the shape and size of the foot with ease. The level of comfort this material provides is high, with its soft feel and non-restrictive wrapping.

In addition to the mentioned benefits, runners are given the chance to feel enough ventilation from this material. Because it is made up of mesh, air can easily pass through the network of wires, allowing the heat to escape and the foot to breathe.

The second component of the Isofit system is the lacing which is connected to bands that extend from the eyestay of the shoe. Tightening the laces will also tighten the bands. This produces a more secure fit on the middle part of the dorsal area of the foot.

Flex Film Overlays were added to lightly support the midfoot. These overlays are not just for aesthetic purposes. They slightly enhance the security and snugness without compromising flexibility. The films are also reflective, allowing better visualization when running in low lighted conditions.

The collar lining of the shoe helps with absorbing moisture. Saucony lined it with Rundry, a lining material that has moisture wicking properties. Aside from that, runners also benefit from the plush comfort this material delivers.